Support iso-8859-1 enconding for input and output

[ruffinakoza]

A quick test has showed that XML documents with accented characters are not read and converted properly:

https://cdn.discordapp.com/attachments/658821972427407390/664977824993509376/1.png
https://cdn.discordapp.com/attachments/658821972427407390/664977813245263892/2.png

[ruffinakoza]

Retest the same after utf8 task is implemented.